INTRODUCTION. 
xvn 
Our next fluty is briefly to state what the 
Trustees, in their corporate capacity, have 
effected towards the further increase of the 
establishment committed to their care, if, in 
recording their various acquisitions, we have not 
objects of such magnitude to notice as those 
above specified, yet some, it will be allowed, are 
by no means of trivial import; and it must more¬ 
over be observed, that not only the fund at their 
disposal for these purposes is very limited, but 
that a great part of it is necessarily expended 
from time to time in the purchase of single 
books, and other separate articles, which occa¬ 
sionally present themselves for sale, and which, 
however important, are yet far too numerous to 
be here specifically described. 
It might well be expected, that in consequence 
of the great progress made of late years in the 
science of Natural History, the collection of Sir 
Hans Sloane, which, when it was purchased, was 
deemed of the first magnitude, would insensi¬ 
bly become retrograde in its comparative value ; 
and this in fact was found to be particularly the 
case in the classes of Ornithology and Minera¬ 
logy. Accordingly, in order to supply the for¬ 
mer of these deficiencies, the Trustees being, in 
the year 1769* informed that a large collection 
d of 
